Testing for custom item names depend heavily on the placement of the text components.
Example:
When testing for an item named "Sun's Cowl" with no italics
This doesn't work:
/execute as @a if data entity @s Inventory[{Slot:103b,id:"minecraft:player_head",components:{"minecraft:custom_name":'{"text":"Sun\'s Cowl","italic":false}'}}] run say @sBut this does:
/execute as @a if data entity @s Inventory[{Slot:103b,id:"minecraft:player_head",components:{"minecraft:custom_name":'{"italic":false,"text":"Sun\'s Cowl"}'}}] run say @sDesired result:
Testing for the components won't matter where the same components were placed
Comments 2
I can't make either work.
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NBT tests have to match exactly; any differing value is deemed not a match by definition.
This is not a bug, and you shouldn't rely your systems on player-facing strings. Use custom data instead. See MC-175743.